Merge "Tethering: remove dead code" am: abc0246c4f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2138294

Change-Id: Ib8c4a69df90ae04a51a9ba18006f7780610a6a65
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>